Both of these dramas star Nakama Yukie as "Saki", and although the stories are quite different they give off a similar feeling. Nakama Yukie is brilliant, and her acting is compelling and terrifying at the same time. These two stories could be the same person, but they could also be not.
These two dramas have a similar feel. Both main characters start to live independently and need to financially support someone completely oblivious to the rules of the world. Both dramas also emit a feeling of a loyal dog and its owner.
Both of these dramas feature a similar mix of poignant political (mostly historically accurate) intrigue, life and death situations, and a passionate romance at its core. Therefore they give of a similar feel.
Both stories tell that of a child's kidnapping case and a mother who takes action to solve the case on her own.